On my '68 Road Runner I was able to fit 305/40/18s (10" wheel) on the rear without any issue. I ran 5.5" BS which gives me about 1/2" clearance with the outer fender and 1.5" clearance to the leaf spring.
On the fronts I'm running a 255/45/18 (9" wheel) with 4.5" BS. There is a minor issue with rubbing the frame rail on the passenger side at full lock.
I was told I could run 275s on the front but decided I didn't want to go that large.
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